Net Loss Per Share (Tables)

3 Months Ended

Apr. 30, 2016

Earnings Per Share [Abstract]

Computation of basic and diluted net income (loss) per share

The following provides the computation of basic and diluted net loss per share:

	Three months ended April 30,
	2016			2015
Net loss attributable to Mentor Graphics shareholders	$	(13,436	)	$	(9,885	)
Adjustment to redemption value of noncontrolling interest with redemption feature	—			269
Adjusted net loss attributable to Mentor Graphics shareholders	$	(13,436	)	$	(9,616	)
Weighted average common shares used to calculate basic net loss per share	109,085			116,003
Potential common shares	—			—
Weighted average common and potential common shares used to calculate diluted net loss per share	109,085			116,003
Net loss per share attributable to Mentor Graphics shareholders:
Basic net loss per share	$	(0.12	)	$	(0.08	)
Diluted net loss per share	$	(0.12	)	$	(0.08	)

We have adjusted the numerator of our basic and diluted loss per share calculation for the three months ended April 30, 2015 for the adjustment of the noncontrolling interest with redemption feature to its calculated redemption value, recorded directly to retained earnings.

Adjustments to Net Income excluded from the computation of diluted EPS

The following details the adjustments to net loss excluded from the computation of diluted net loss per share for the three months ended April 30, 2016 and April 30, 2015:

	Three months ended April 30,
	2016		2015
Adjustment for convertible debt interest, net of tax to be forfeited upon conversion of 4.00% Debentures	$	—	$	519

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following details shares excluded from the computation of diluted net loss per share:

	Three months ended April 30,
	2016	2015
Shares of common stock for restricted stock units	2,298	1,254
Shares of common stock for stock options	1,208	1,284
Shares of common stock for ESPP purchase rights	51	100
Shares of common stock for convertible debt	—	2,116
Total anti-dilutive shares excluded	3,557	4,754

The stock options, restricted stock units, ESPP purchase rights, and the 4.00% Debentures were determined to be anti-dilutive because we incurred a net loss for both periods.